But A and B are relatively prime, primes are also least, and the least measure the numbers which have the same ratio the same number of times, the greater the greater and the less the less, therefore B measures E as the consequent the consequent.

The least common multiple of two numbers a and b is the smallest number that they both divide. It is denoted LCM(a, b). This proposition constructs it as the product divided by the greatest common divisor: